Coal carburetor



Patented Dec. 15, 1925.

UNITED STATES DAVID WENTWORTH ROBB. OF AMHERST, NOVA SOOTIA, CANADA.

COAL CARBURETOR.

Application filed January 19, 1923. Serial No. 613,747.

To all whom it may] concern:

Be it known that I, DAVID Vmwrwourrr Rona, a subject of the King of Great Britain, residing at Amherst, in the Province of Nova Scotia, Dominion of Canada, have invented certain new and useful Improvements in Coal Carbm'etors; and I do hereby declare the following to bea full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to devices for use in connection with a furnace or steam boilor and serving to heat the airdrawn in over thetop of the fire.

The principal object of the present invention is to provide a fuel saver of this type- Which will permit practically perfect combustion of the fuel.

A further object of the invention is to provide a fuel saver that is relatively simple to manufacture and which will serve efiiciently throughout a relatively long life. A further object is to improve the construction of existing coal carburetors by widening out the nozzle into fan shape so as to throw the air out as much as possible over the fire and drawing down the nozzle to a thin aperture near the outlet in order to give more effective heating of the air.

A still further object of the present invention is to provide an effective arrangement of baflles and bridges within a coal carburetor so as to strengthen the structure to prevent warping under the intense heat to which it is subjected and to direct the air to the sides as much as possible by interfering by bafiles with the direct flow of air through the center of the device.

In the drawings Figure 1 is a vertical section through the center of a carburetor built in accordance with the present invention.

Fig. 2 shows a top plan view of the same partly broken away however on the center line to show a central horizontal section.

Fig. .3 is a fragmentary horizontal section through the nozzle portion of a modified form such as would be used for example with hard or anthracite coal.

The only difference between the coal car buretor for use with bituminous coal and that for anthracite coal lies in the provision of a few extra bridges in the anthracite nozzle as shown particularly in Fig. 3 so that the vertical. section and the plan. view of the hard and soft coal types are identical.

The major portion 110 of the coal carburetor or air heating attachment is generally conical having a rounded end 111 near single spiral rib running from one end of the device to the other. It will be noted from Fig. 2 that the ribs 11'? extend over the conical portion 110 and over the fan-shaped discharge portion 118, the ribs 117 merging into and being integral with the arc-shaped ribs 119 on the discharge portion, the latter having an arcuate smooth stiffening rib 120 slightly wider and lower than the ribs 119 and concentric therewith.

The discharge passage 121 is a slot-like member relatively narrow in height but eX- tending throughout the entire arc of the nozzle. A number of bridges or divisions 122 are provided to serve a dual function, namely, to strengthen the structure so that it will not warp under the intense heat to which the device is subjected and further and more important to spread out the air so as to deliver it to the sides as much as possible so that the air is discharged among the gases arising from the coal in a spray form rather than as a single jet.

As previously stated the number of these bridges 122 will be considerably increased if the coal carburetor is to be used with hard coal, the simplest way of accomplishing this being to insert a somewhat smaller bridge 123 (see Fig. 3) between each of the bridges 122 shown in Fig. 2.

The great advantage of the arcuate nozzle of air outlet is that since it is widened out into fan-shape the air is discharged over all the fire and since the nozzle is drawn down to a thin aperture 121 near the outlet a much more effective heating of the air is possible.

In order to prevent the great volume of air passing through the coal carburetor to be discharged centrally a number of bafiies such as 130 and 181 are interposed in the central portion of the device, these baflles extending downwardly from the upper wall of the main conical portion 110 and being staggered with respect to the similar bailles 1.32 and 133 which extend upwardly trom the lower wall. Referring particularly to the sectional portion of Fig. 2 it will be noted that no one of the tour baiiies extend the full width of the structure and therefore a free passage is provided as at 134- between the baffles and the side wall of the carburetor and through these two passages 134, one on either side of the heater, the principal volume of the air is carried thus giving the advantage of a very even distribution of the air which passes freely on the two sides but is forced through the tortuous path in the center of the carburetor.

The air regulator H6 is of the usual type in devices of this nature having the customary disk type slide 1.35 which may be locked in desired position by means of the thumb nut 136. The bolts illsif desired may be replaced by other fastening means to secure together the coal carburetor, the furnace door, and the air regulator so as to form in effect a single unit.

What I claim is:

1. A coal carburetor consisting of a conoid and an integral fiat areuate portion, the latter having a narrow slotted nozzle, a plurality of bafiies extending from the central portion only of the upper wall of the conoid, and additional baflies staggered with respect to the first mentioned battles for causing the air passing from the entrance of the carburetor to the center of the nozzle to travel in a tortuous path while permitting free passage of the air from the entrance to the sides of the nozzle.

2. A coal carburetor consisting of a hollow member having a large entrance and a small exit, having a plurality OT: battles therein, alternate battles extending from one oi the walls of said member, and all of said baiiles being spaced from another 0? the walls of said member in order to provide an unobstructed passage along said last mentioned wall from the entrance to the exit of said member.

A coal carburetor consisting ot a hollow member having a large entrance and a small exit having a plurality oi bafiles therein, alternate bafiies extending from the top wall of said member, and all of said bafiies being spaced from a side wall of said. member in order to provide an unobstructed passage along said last mentioned wall from the entrance to the exit of said member.

at. A coal carburetor consisting of a hollow conoid having a rounded smaller end,

and a thin fiat fan shaped member having a narrow slot therein and merging with said conoid to provide a device converging in plan from each end toward the center, and a plurality of staggered baflles in said conoid extending from the top and bottom alternately and each spaced from each of the sides to provide an unobstructed passageway at either side of the series of baflles.

DAVID VENTWORTH. ROBE. 

